GoAir — extra payment sought for aisle or window seat allocation

Dear sir,
Three o[censored]s were travelling by flight no. 557 from new delhi to bengaluru on friday (22.09.2017) at 6.50 pm flight. We had booked our tickets together. When we tried to make the online boarding pass, we were informed that if we wanted to be allotted seats together (In sequence) for aisle seat we have to pay rs.99/- and for window seat we have to pay rs. 199/-. I felt this is a bad practice. We had booked our seats together and payment also was made from the same credit card. We were a group. The airlines should not have broken our group. We declined to pay extra money. So we were allotted 23f, 24e and 25e. So, all the three o[censored]s of the same group were separated into different rows. I did not feel it fair on the airlines part to adopt such measures for a few extra bucks. Please see whether i make any sense.